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Data Qualifiers: How Do You Qualify Your Data? Use and Application of Data Qualifiers According to Chapter 62-160, F.A.C. Betsy Kent Reedy Creek Improvement District, Lake Buena Vista, Florida. Precision. The sample and the duplicate values are > LOD and < LOQ and qualified as < LOQ.

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Data Qualifiers:How Do You Qualify Your Data?Use and Application of Data Qualifiers According to Chapter 62-160, F.A.C.

Betsy Kent

Reedy Creek Improvement District, Lake Buena Vista, Florida


Precision
Precision

  • The sample and the duplicate values are > LOD and < LOQ and qualified as < LOQ.

  • The RPD for these values is > UCL.

  • Do you qualify the data for precision failure?

  • Do you use the RPD in the statistical calculation of limits?


Precision1
Precision

  • The sample value is slightly greater than the LOQ and the duplicate value is between the LOD and LOQ.

  • The RPD for these values is > UCL.

  • Do you qualify the data?

  • Do you use the RPD in the statistical calculation of limits?


Precision2
Precision

  • The sample value is between the LOD and LOQ and qualified as such. The duplicate value is < LOD (ND).

  • Do you calculate a RPD?

  • If yes, what value do you use for the non-detect?

  • Do you qualify the data?

  • If calculated, do you use the RPD in the statistical calculation of limits?


Precision3
Precision

  • The LOD is 1.0 ppm.

  • The LOQ is 4.0 ppm.

  • The sample value is 4.0 ppm

  • The duplicate value is 4.9 ppm

  • The RPD UCL is 20.0.

  • The RPD for these values is 20.2.

  • Do you qualify the Data?


Precision4
Precision

  • Does your laboratory have a documented procedure to use a factor to determine when to evaluate data for precision?

  • Example: If concentrations < 5x LOD then RPD is NA.

  • Is this procedure acceptable under the NELAC 2003 Standard? FDEP 62-160?


Precision nelac 2003 standard
PrecisionNELAC 2003 Standard

  • D.1.1.3.2

  • a) Purpose: matrix duplicates are defined as replicate aliquots of the same sample taken through the entire analytical procedure. The results from this analysis indicate the precision of the results from the specific sample using the selected method. The matrix duplicate provides a usable measure of precision only when target analytes are found in the sample chosen for duplication.


Precision nelac 2003 standard1
PrecisionNELAC 2003 Standard

  • D.1.1.3.2

  • d) Evaluation Criteria and Corrective Action: The results from matrix duplicates are primarily designed to assess the precision of analytical results in a given matrix and are expressed as relative percent difference (RPD) or other statistical treatment (e.g., absolute differences). The laboratory shall document the calculation for relative percent difference or other statistical treatments.


Precision nelac 2003 standard2
PrecisionNELAC 2003 Standard

  • D.1.1.3.2

  • d cont.) Results are compared to the acceptance criteria as published in the mandated test method. Where there are no established criteria, the laboratory shall determine internal criteria and document the method used to establish the limits. For matrix duplicate results outside established criteria corrective actions shall be documented or the data reported with appropriate data qualifying codes.


Accuracy
Accuracy

  • The MS is within %R control limits.

  • The MSD is outside %R control limits.

  • The MS/MSD RPD is within RPD control limits.

  • Do you qualify the data for accuracy failure?


Accuracy nelac 2003 standard
AccuracyNELAC 2003 Standard

Program Policy and Structure - Appendix A - Glossary (Effective July 1, 2005)

Matrix Spike Duplicate (spiked sample or fortified sample duplicate): a second replicate matrix spike prepared in the laboratory and analyzed to obtain a measure of the precision of the recovery of each analyte. (QAMS)


Accuracy1
Accuracy

  • The MS and MSD are outside %R control limits.

  • The LCS and all associated method QC is within control limits.

  • Do you qualify the data for accuracy failure citing suspect matrix interference? How do you determine that matrix interference was the cause?


Accuracy2
Accuracy

  • The %R’s for MS and MSD are < LCL.

  • The data is qualified for accuracy failure.

  • Do you include information of low bias recovery on the data report?

  • The %R’s for MS and MSD are > UCL.

  • The data is qualified for accuracy failure.

  • Do you include information of high bias recovery on the data report?


Accuracy3
Accuracy

  • EPA 8260 –Analyze sample with 4 surrogate standards

  • 1 out of 4 surrogates is outside %R limits.

  • Do you qualify data results?

  • All compounds? Sub-set of compounds?

  • Do you include information on bias on the data report?


Accuracy4
Accuracy

  • EPA 8270 – Analyze sample with 3 BN and 3 Acid surrogate standards

  • 1 out of 3 BN surrogates is outside %R limits.

  • Do you qualify data results? All compounds? All BN compounds? Sub-set BN compounds?

  • Do you include information on bias on the data report?


Data reports where do you place the p a qualifiers
Data ReportsWhere Do You Place the P&A Qualifiers?

  • On the Data Report with the sample value?

  • On the Quality Control Report with the RPD and/or %R?

  • In the Case Narrative?

  • In Sample Comments?


Data reports where do you place the p a qualifiers1
Data ReportsWhere Do You Place the P&A Qualifiers?

  • How do you address data received from a sub-contract laboratory that does not include the data qualifier(s) next to the sample value?


Thank you betsy kent rcid environmental services betsy kent@rcid dst fl us
Thank youBetsy KentRCID Environmental [email protected]


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